#pragma once
#include "Utils.h"
#include "Isaac.h"
/// <summary>
/// Palette class.
/// </summary>
namespace EmberNs
{
/// <summary>
/// The palette stores a set of 256 colors which are what get accumulated to the histogram
/// for each iteration. The colors come from either the main palette Xml file or directly
/// from the ember parameter file. Either way, they come in as 0-255 and get normalized to 0-1.
/// In the future, 2D palette support might be added in which case this class will have to be modified.
/// Template argument expected to be float or double.
/// </summary>
template <typename T>
class EMBER_API Palette
{
public:
/// <summary>
/// Constructor which sets the palette index to random and allocates space to hold the color entries.
/// </summary>
Palette()
{
m_Name = "-";
m_Index = -1;
m_Entries.resize(COLORMAP_LENGTH);
Clear();
}
/// <summary>
/// Constructor that takes a name various parameters. If no color buffer is specified, a default is used.
/// This is a safety fallback, and it's highly recommended to always supply a buffer of color entries.
/// </summary>
/// <param name="name">The name of the palette</param>
/// <param name="index">The index in the palette file</param>
/// <param name="size">The size of the palette which should be 256</param>
/// <param name="xmlPaletteEntries">A pointer to 256 color entries</param>
Palette(const string& name, int index, size_t size, v4T* xmlPaletteEntries)
{
m_Name = name;
m_Index = index;
m_Entries.resize(size);
if (xmlPaletteEntries)
{
memcpy(&m_Entries[0], xmlPaletteEntries, Size() * sizeof(m_Entries[0]));
}
else//They passed in null, so just fill with hard coded values so they at least have something.
{
//Palette 15 used in the test ember file.
byte palette15[COLORMAP_LENGTH * 4] = {
0x00, 0xda, 0xde, 0xbc, 0x00, 0xee, 0xe6, 0xc5, 0x00, 0xee, 0xf2, 0xce, 0x00, 0xee, 0xf2, 0xcf, 0x00, 0xe6, 0xee, 0xe1, 0x00, 0xea, 0xee, 0xd8, 0x00, 0xf2, 0xf1, 0xeb, 0x00, 0xf2, 0xf5, 0xd8,
0x00, 0xe6, 0xf2, 0xce, 0x00, 0xde, 0xea, 0xc5, 0x00, 0xd6, 0xda, 0xc6, 0x00, 0xce, 0xd2, 0xbc, 0x00, 0xc2, 0xca, 0xa9, 0x00, 0xbe, 0xca, 0xa0, 0x00, 0xce, 0xd6, 0xaa, 0x00, 0xde, 0xe2, 0xc5,
0x00, 0xea, 0xed, 0xce, 0x00, 0xea, 0xf2, 0xc5, 0x00, 0xde, 0xe2, 0xc5, 0x00, 0xc2, 0xca, 0xaa, 0x00, 0xae, 0xbe, 0xaa, 0x00, 0xa5, 0xb2, 0x96, 0x00, 0xa2, 0xa9, 0x8d, 0x00, 0x96, 0xa2, 0x84,
0x00, 0x8d, 0x8d, 0x7a, 0x00, 0x85, 0x89, 0x71, 0x00, 0x85, 0x8d, 0x71, 0x00, 0x85, 0x85, 0x67, 0x00, 0x79, 0x7d, 0x67, 0x00, 0x79, 0x7d, 0x67, 0x00, 0x71, 0x79, 0x5e, 0x00, 0x65, 0x6d, 0x55,
0x00, 0x4d, 0x5d, 0x42, 0x00, 0x34, 0x40, 0x25, 0x00, 0x30, 0x40, 0x25, 0x00, 0x30, 0x38, 0x1c, 0x00, 0x2c, 0x3c, 0x1c, 0x00, 0x2c, 0x34, 0x1c, 0x00, 0x24, 0x2c, 0x12, 0x00, 0x24, 0x24, 0x00,
0x00, 0x24, 0x2c, 0x09, 0x00, 0x28, 0x34, 0x09, 0x00, 0x38, 0x40, 0x12, 0x00, 0x30, 0x40, 0x1c, 0x00, 0x40, 0x50, 0x2f, 0x00, 0x55, 0x69, 0x42, 0x00, 0x65, 0x75, 0x55, 0x00, 0x6c, 0x7d, 0x5e,
0x00, 0x74, 0x8d, 0x71, 0x00, 0x74, 0x89, 0x84, 0x00, 0x74, 0x8d, 0x84, 0x00, 0x78, 0x8d, 0x84, 0x00, 0x79, 0x89, 0x7a, 0x00, 0x79, 0x85, 0x71, 0x00, 0x75, 0x7d, 0x67, 0x00, 0x71, 0x79, 0x5e,
0x00, 0x6c, 0x71, 0x5e, 0x00, 0x6d, 0x70, 0x5e, 0x00, 0x6c, 0x79, 0x5e, 0x00, 0x68, 0x75, 0x5e, 0x00, 0x69, 0x71, 0x55, 0x00, 0x6d, 0x75, 0x55, 0x00, 0x6d, 0x75, 0x55, 0x00, 0x69, 0x71, 0x55,
0x00, 0x65, 0x71, 0x55, 0x00, 0x69, 0x6d, 0x55, 0x00, 0x64, 0x71, 0x5e, 0x00, 0x68, 0x70, 0x67, 0x00, 0x68, 0x70, 0x67, 0x00, 0x68, 0x6c, 0x67, 0x00, 0x6c, 0x6c, 0x5e, 0x00, 0x71, 0x71, 0x5e,
0x00, 0x79, 0x79, 0x67, 0x00, 0x81, 0x85, 0x71, 0x00, 0x7d, 0x91, 0x71, 0x00, 0x85, 0x92, 0x7a, 0x00, 0x85, 0x92, 0x7a, 0x00, 0x7d, 0x92, 0x84, 0x00, 0x79, 0x92, 0x84, 0x00, 0x78, 0x92, 0x8d,
0x00, 0x78, 0x8d, 0x8d, 0x00, 0x74, 0x8d, 0x84, 0x00, 0x74, 0x92, 0x84, 0x00, 0x75, 0x92, 0x7a, 0x00, 0x6c, 0x85, 0x67, 0x00, 0x64, 0x79, 0x5e, 0x00, 0x59, 0x69, 0x4b, 0x00, 0xaa, 0x57, 0x00,
0x00, 0x38, 0x44, 0x1c, 0x00, 0x30, 0x3c, 0x1c, 0x00, 0x2c, 0x3c, 0x1c, 0x00, 0x34, 0x40, 0x25, 0x00, 0x50, 0x61, 0x4b, 0x00, 0x5d, 0x6d, 0x5e, 0x00, 0x64, 0x71, 0x5e, 0x00, 0x60, 0x71, 0x5e,
0x00, 0x60, 0x75, 0x5e, 0x00, 0x68, 0x75, 0x5e, 0x00, 0x6c, 0x79, 0x5e, 0x00, 0x6c, 0x79, 0x5e, 0x00, 0x71, 0x79, 0x67, 0x00, 0x70, 0x79, 0x67, 0x00, 0x6c, 0x7d, 0x67, 0x00, 0x68, 0x79, 0x67,
0x00, 0x6c, 0x79, 0x67, 0x00, 0x6c, 0x75, 0x67, 0x00, 0x71, 0x75, 0x5e, 0x00, 0x71, 0x75, 0x5e, 0x00, 0x75, 0x79, 0x5e, 0x00, 0x75, 0x7d, 0x5e, 0x00, 0x81, 0x8d, 0x5e, 0x00, 0x8d, 0x92, 0x5e,
0x00, 0x8d, 0x92, 0x67, 0x00, 0x9a, 0x9a, 0x71, 0x00, 0x9a, 0xa2, 0x7a, 0x00, 0x9a, 0xa2, 0x7a, 0x00, 0x9a, 0xa1, 0x7a, 0x00, 0x92, 0x9a, 0x71, 0x00, 0x89, 0x92, 0x67, 0x00, 0x81, 0x85, 0x5e,
0x00, 0x7d, 0x7d, 0x55, 0x00, 0x69, 0x79, 0x4b, 0x00, 0x61, 0x6d, 0x42, 0x00, 0x44, 0x4c, 0x25, 0x00, 0x38, 0x44, 0x1c, 0x00, 0x40, 0x51, 0x25, 0x00, 0x45, 0x4d, 0x25, 0x00, 0x71, 0x6d, 0x42,
0x00, 0x79, 0x7d, 0x4b, 0x00, 0x81, 0x7d, 0x55, 0x00, 0x79, 0x79, 0x55, 0x00, 0x6d, 0x75, 0x55, 0x00, 0x69, 0x7d, 0x55, 0x00, 0x6c, 0x79, 0x5e, 0x00, 0x65, 0x79, 0x54, 0x00, 0x68, 0x79, 0x5e,
0x00, 0x64, 0x79, 0x67, 0x00, 0x64, 0x79, 0x67, 0x00, 0x68, 0x75, 0x5e, 0x00, 0x64, 0x71, 0x5e, 0x00, 0x64, 0x6c, 0x5e, 0x00, 0x65, 0x6d, 0x55, 0x00, 0x4d, 0x58, 0x42, 0x00, 0x34, 0x40, 0x25,
0x00, 0x2c, 0x38, 0x1c, 0x00, 0x20, 0x28, 0x1c, 0x00, 0x1c, 0x14, 0x09, 0x00, 0x18, 0x18, 0x00, 0x00, 0x04, 0x14, 0x00, 0x00, 0x08, 0x10, 0x00, 0x00, 0x0c, 0x18, 0x00, 0x00, 0x1c, 0x28, 0x09,
0x00, 0x24, 0x30, 0x12, 0x00, 0x3c, 0x44, 0x25, 0x00, 0x5d, 0x65, 0x55, 0x00, 0x75, 0x79, 0x55, 0x00, 0x85, 0x89, 0x5e, 0x00, 0x89, 0x91, 0x71, 0x00, 0x96, 0xa2, 0x71, 0x00, 0x9a, 0xa2, 0x7a,
0x00, 0x9e, 0xaa, 0x7a, 0x00, 0x9e, 0xaa, 0x7a, 0x00, 0xaa, 0xae, 0x71, 0x00, 0xa6, 0xaa, 0x7a, 0x00, 0xa2, 0xaa, 0x7a, 0x00, 0xa1, 0xa5, 0x7a, 0x00, 0x96, 0x9e, 0x7a, 0x00, 0x85, 0x96, 0x7a,
0x00, 0x81, 0x92, 0x7a, 0x00, 0x78, 0x92, 0x7a, 0x00, 0x75, 0x92, 0x7a, 0x00, 0x75, 0x8d, 0x7a, 0x00, 0x70, 0x81, 0x67, 0x00, 0x7d, 0x7d, 0x67, 0x00, 0x89, 0x89, 0x67, 0x00, 0x92, 0x9a, 0x71,
0x00, 0x9e, 0xaa, 0x7a, 0x00, 0xaa, 0xb6, 0x84, 0x00, 0xb2, 0xb6, 0x8d, 0x00, 0xb6, 0xba, 0x97, 0x00, 0xc2, 0xca, 0x97, 0x00, 0xb2, 0xbe, 0x8d, 0x00, 0xb2, 0xb6, 0x8d, 0x00, 0xaa, 0xb2, 0x8d,
0x00, 0xa2, 0xae, 0x84, 0x00, 0x9a, 0xa6, 0x7a, 0x00, 0x92, 0x9e, 0x7a, 0x00, 0x85, 0x9a, 0x7a, 0x00, 0x7d, 0x96, 0x7a, 0x00, 0x7d, 0x92, 0x7a, 0x00, 0x7d, 0x92, 0x84, 0x00, 0x7d, 0x92, 0x84,
0x00, 0x81, 0x96, 0x84, 0x00, 0x85, 0x96, 0x84, 0x00, 0x85, 0x96, 0x84, 0x00, 0x81, 0x92, 0x84, 0x00, 0x85, 0x9a, 0x84, 0x00, 0x85, 0x9a, 0x84, 0x00, 0x8d, 0x9a, 0x84, 0x00, 0x92, 0x96, 0x84,
0x00, 0x9e, 0xa9, 0x84, 0x00, 0xae, 0xb2, 0x84, 0x00, 0xaa, 0xba, 0x84, 0x00, 0xb2, 0xbe, 0x8d, 0x00, 0xb6, 0xc2, 0xa0, 0x00, 0xc6, 0xca, 0xa0, 0x00, 0xc6, 0xce, 0xaa, 0x00, 0xd6, 0xda, 0xb3,
0x00, 0xda, 0xe2, 0xc5, 0x00, 0xd2, 0xd6, 0xbc, 0x00, 0xbe, 0xc2, 0xa0, 0x00, 0xaa, 0xb6, 0x8d, 0x00, 0x9e, 0xa6, 0x7a, 0x00, 0x92, 0x9a, 0x71, 0x00, 0x89, 0x89, 0x71, 0x00, 0x81, 0x7d, 0x67,
0x00, 0x7d, 0x7d, 0x67, 0x00, 0x81, 0x78, 0x67, 0x00, 0x7d, 0x7d, 0x5e, 0x00, 0x79, 0x79, 0x5e, 0x00, 0x79, 0x81, 0x5e, 0x00, 0x81, 0x7d, 0x67, 0x00, 0x81, 0x7d, 0x67, 0x00, 0x81, 0x81, 0x67,
0x00, 0x81, 0x89, 0x71, 0x00, 0x85, 0x91, 0x7a, 0x00, 0x89, 0x92, 0x7a, 0x00, 0x96, 0x9d, 0x7a, 0x00, 0x96, 0x9e, 0x7a, 0x00, 0x92, 0x96, 0x84, 0x00, 0x96, 0x9a, 0x8d, 0x00, 0x92, 0x92, 0x84,
0x00, 0x89, 0x91, 0x84, 0x00, 0x81, 0x92, 0x84, 0x00, 0x7d, 0x92, 0x8d, 0x00, 0x78, 0x92, 0x8d, 0x00, 0x74, 0x92, 0x8d, 0x00, 0x78, 0x92, 0x8d, 0x00, 0x78, 0x96, 0x97, 0x00, 0x81, 0x96, 0x8d,
0x00, 0x81, 0x96, 0x8d, 0x00, 0x81, 0x9a, 0x8d, 0x00, 0x85, 0x9a, 0x8d, 0x00, 0x89, 0x9e, 0x8d, 0x00, 0x89, 0x9e, 0x8d, 0x00, 0x8d, 0xa2, 0x97, 0x00, 0x95, 0xa2, 0x97, 0x00, 0x8d, 0xa2, 0x97,
0x00, 0x96, 0xa6, 0x8d, 0x00, 0x9a, 0xa1, 0x8d, 0x00, 0x9e, 0xa9, 0x84, 0x00, 0x9e, 0xa6, 0x7a, 0x00, 0xa2, 0xa5, 0x71, 0x00, 0x9e, 0xa6, 0x71, 0x00, 0x9a, 0xa6, 0x71, 0x00, 0x95, 0x9d, 0x71 };
for (size_t i = 0; i < size; i++)
{
m_Entries[i].a = T(palette15[i * 4 + 0]);
m_Entries[i].r = T(palette15[i * 4 + 1]);
m_Entries[i].g = T(palette15[i * 4 + 2]);
m_Entries[i].b = T(palette15[i * 4 + 3]);
}
}
}
/// <summary>
/// Default copy constructor.
/// </summary>
/// <param name="palette">The Palette object to copy</param>
Palette(const Palette<T>& palette)
{
Palette<T>::operator=<T>(palette);
}
/// <summary>
/// Copy constructor to copy a Palette object of type U.
/// </summary>
/// <param name="palette">The Palette object to copy</param>
template <typename U>
Palette(const Palette<U>& palette)
{
Palette<T>::operator=<U>(palette);
}
/// <summary>
/// Empty destructor.
/// Needed to eliminate warnings about inlining.
/// </summary>
~Palette()
{
}
/// <summary>
/// Default assignment operator.
/// </summary>
/// <param name="palette">The Palette object to copy</param>
Palette<T>& operator = (const Palette<T>& palette)
{
if (this != &palette)
Palette<T>::operator=<T>(palette);
return *this;
}
/// <summary>
/// Assignment operator to assign a Palette object of type U.
/// </summary>
/// <param name="palette">The Palette object to copy</param>
/// <returns>Reference to updated self</returns>
template <typename U>
Palette<T>& operator = (const Palette<U>& palette)
{
m_Index = palette.m_Index;
m_Name = palette.m_Name;
m_Filename = palette.m_Filename;
CopyVec(m_Entries, palette.m_Entries);
return *this;
}
/// <summary>
/// Convenience [] operator to index into the color entries vector.
/// </summary>
/// <param name="i">The index to get</param>
/// <returns>The color value at the specified index</returns>
v4T& operator[] (size_t i)
{
return m_Entries[i];
}
/// <summary>
/// Convenience * operator to get a pointer to the beginning of the color entries vector.
/// </summary>
/// <returns>The address of the first element in the color entries vector</returns>
inline v4T* operator() (void)
{
return &m_Entries[0];
}
/// <summary>
/// The size of the color entries vector.
/// </summary>
/// <returns>The size of the color entries vector</returns>
size_t Size() { return m_Entries.size(); }
/// <summary>
/// Set all colors to either black or white, including the alpha channel.
/// </summary>
/// <param name="black">Set all colors to black if true, else white</param>
void Clear(bool black = true)
{
for (glm::length_t i = 0; i < Size(); i++)
{
for (glm::length_t j = 0; j < 4; j++)
{
if (black)
m_Entries[i][j] = 0;
else
m_Entries[i][j] = 1;
}
}
}
/// <summary>
/// Make a copy of this palette, adjust for hue and store in the passed in palette.
/// This is used because one way an ember Xml can specify color is with an index in the
/// palette Xml file and a hue rotation value.
/// </summary>
/// <param name="palette">The palette to store the results in</param>
/// <param name="hue">The hue rotation to apply</param>
void MakeHueAdjustedPalette(Palette<T>& palette, T hue)
{
palette.m_Index = m_Index;
palette.m_Name = m_Name;
palette.m_Filename = m_Filename;
palette.m_Entries.resize(Size());
for (size_t i = 0; i < Size(); i++)
{
size_t ii = (i * 256) / COLORMAP_LENGTH;
T rgb[3], hsv[3];
rgb[0] = m_Entries[ii].r;
rgb[1] = m_Entries[ii].g;
rgb[2] = m_Entries[ii].b;
RgbToHsv(rgb, hsv);
hsv[0] += hue * T(6.0);
HsvToRgb(hsv, rgb);
//Alpha serves as merely a hit counter that gets incremented by 1 each time, see Renderer::Accumulate() for its usage.
//Removing it saves no memory since it's 16 byte aligned. This also means alpha is not used.
palette[i].r = rgb[0];
palette[i].g = rgb[1];
palette[i].b = rgb[2];
palette[i].a = 1;
}
}
/// <summary>
/// More advanced adjustment than MakeHueAdjustedPalette() provides.
/// Adjustments are applied in the order:
/// Frequency, index rotation, hue rotation, saturation, brightness, contrast, blur.
/// </summary>
/// <param name="palette">The palette to store the result in</param>
/// <param name="rot">Index rotation.</param>
/// <param name="hue">Hue rotation -5 - 5</param>
/// <param name="sat">Saturation 0 - 1</param>
/// <param name="bright">Brightness 0 - 1</param>
/// <param name="cont">Contrast -1 - 2</param>
/// <param name="blur">Blur 0 - 127</param>
/// <param name="freq">Frequency 1 - 10</param>
void MakeAdjustedPalette(Palette<T>& palette, int rot, T hue, T sat, T bright, T cont, uint blur, uint freq)
{
T rgb[3], hsv[3];
if (freq > 1)
{
size_t n = Size() / freq;
for (size_t j = 0; j <= freq; j++)
{
for (size_t i = 0; i <= n; i++)
{
if ((i + j * n) < Size())
{
palette[i + j * n].r = m_Entries[i * freq].r;
palette[i + j * n].g = m_Entries[i * freq].g;
palette[i + j * n].b = m_Entries[i * freq].b;
}
}
}
palette.m_Name = m_Name;
palette.m_Filename = m_Filename;
}
else
{
palette = *this;
}
for (size_t i = 0; i < Size(); i++)
{
size_t ii = (i * 256) / COLORMAP_LENGTH;
rgb[0] = palette[(COLORMAP_LENGTH + ii - rot) % COLORMAP_LENGTH].r;//Rotation.
rgb[1] = palette[(COLORMAP_LENGTH + ii - rot) % COLORMAP_LENGTH].g;
rgb[2] = palette[(COLORMAP_LENGTH + ii - rot) % COLORMAP_LENGTH].b;
RgbToHsv(rgb, hsv);
hsv[0] += hue * T(6.0);//Hue.
hsv[1] = Clamp<T>(hsv[1] + sat, 0, 1);//Saturation.
HsvToRgb(hsv, rgb);
rgb[0] = Clamp<T>(rgb[0] + bright, 0, 1);//Brightness.
rgb[1] = Clamp<T>(rgb[1] + bright, 0, 1);
rgb[2] = Clamp<T>(rgb[2] + bright, 0, 1);
rgb[0] = Clamp<T>(((rgb[0] - T(0.5)) * (cont + T(1.0))) + T(0.5), 0, 1);//Contrast.
rgb[1] = Clamp<T>(((rgb[1] - T(0.5)) * (cont + T(1.0))) + T(0.5), 0, 1);
rgb[2] = Clamp<T>(((rgb[2] - T(0.5)) * (cont + T(1.0))) + T(0.5), 0, 1);
//Alpha serves as merely a hit counter that gets incremented by 1 each time, see Renderer::Accumulate() for its usage.
//Removing it saves no memory since it's 16 byte aligned.
palette[i].r = rgb[0];
palette[i].g = rgb[1];
palette[i].b = rgb[2];
palette[i].a = 1;
}
if (blur > 0)
{
Palette<T> blurPal = palette;
for (int i = 0; i < 256; i++)
{
int n = -1;
rgb[0] = 0;
rgb[1] = 0;
rgb[2] = 0;
for (int j = i - int(blur); j <= i + int(blur); j++)
{
n++;
int k = (256 + j) % 256;
if (k != i)
{
rgb[0] = rgb[0] + blurPal[k].r;
rgb[1] = rgb[1] + blurPal[k].g;
rgb[2] = rgb[2] + blurPal[k].b;
}
}
if (n != 0)
{
palette[i].r = rgb[0] / n;
palette[i].g = rgb[1] / n;
palette[i].b = rgb[2] / n;
}
}
}
}
/// <summary>
/// Make a copy of this palette and multiply all RGB values by a scalar.
/// </summary>
/// <param name="palette">The palette to store the result in</param>
/// <param name="colorScalar">The color scalar to multiply each RGB value by</param>
template<typename bucketT>
void MakeDmap(Palette<bucketT>& palette, T colorScalar = 1)
{
palette.m_Index = m_Index;
palette.m_Name = m_Name;
palette.m_Filename = m_Filename;
if (palette.Size() != Size())
palette.m_Entries.resize(Size());
for (size_t j = 0; j < palette.Size(); j++)
{
palette.m_Entries[j] = m_Entries[j] * colorScalar;
palette.m_Entries[j].a = 1;
}
}
/// <summary>
/// Make a buffer with the color values of this palette scaled to 255
/// and repeated for a number of rows.
/// Convenience function for displaying this palette on a GUI.
/// </summary>
/// <param name="height">The height of the output block</param>
/// <returns>A vector holding the color values</returns>
vector<byte> MakeRgbPaletteBlock(size_t height)
{
size_t width = Size();
vector<byte> v(height * width * 3);
if (v.size() == (height * Size() * 3))
{
for (size_t i = 0; i < height; i++)
{
for (size_t j = 0; j < width; j++)
{
v[(width * 3 * i) + (j * 3)] = byte(m_Entries[j][0] * T(255));//Palettes are as [0..1], so convert to [0..255] here since it's for GUI display.
v[(width * 3 * i) + (j * 3) + 1] = byte(m_Entries[j][1] * T(255));
v[(width * 3 * i) + (j * 3) + 2] = byte(m_Entries[j][2] * T(255));
}
}
}
return v;
}
/// <summary>
/// Convert RGB to HSV.
/// </summary>
/// <param name="r">Red 0 - 1</param>
/// <param name="g">Green 0 - 1</param>
/// <param name="b">Blue 0 - 1</param>
/// <param name="h">Hue 0 - 6</param>
/// <param name="s">Saturation 0 - 1</param>
/// <param name="v">Value 0 - 1</param>
static void RgbToHsv(T r, T g, T b, T& h, T& s, T& v)
{
T max, min, del, rc, gc, bc;
max = std::max(std::max(r, g), b);//Compute maximum of r, g, b.
min = std::min(std::min(r, g), b);//Compute minimum of r, g, b.
del = max - min;
v = max;
s = (max != 0) ? (del / max) : 0;
h = 0;
if (s != 0)
{
rc = (max - r) / del;
gc = (max - g) / del;
bc = (max - b) / del;
if (r == max)
h = bc - gc;
else if (g == max)
h = 2 + rc - bc;
else if (b == max)
h = 4 + gc - rc;
if (h < 0)
h += 6;
}
}
/// <summary>
/// Wrapper around RgbToHsv() which takes buffers as parameters instead of individual components.
/// </summary>
/// <param name="rgb">The RGB buffer</param>
/// <param name="hsv">The HSV buffer</param>
static void RgbToHsv(T* rgb, T* hsv)
{
RgbToHsv(rgb[0], rgb[1], rgb[2], hsv[0], hsv[1], hsv[2]);
}
/// <summary>
/// Convert HSV to RGB.
/// </summary>
/// <param name="h">Hue 0 - 6</param>
/// <param name="s">Saturation 0 - 1</param>
/// <param name="v">Value 0 - 1</param>
/// <param name="r">Red 0 - 1</param>
/// <param name="g">Green 0 - 1</param>
/// <param name="b">Blue 0 - 1</param>
static void HsvToRgb(T h, T s, T v, T& r, T& g, T& b)
{
intmax_t j;
T f, p, q, t;
while (h >= 6)
h -= 6;
while (h < 0)
h += 6;
j = Floor<T>(h);
f = h - j;
p = v * (1 - s);
q = v * (1 - (s * f));
t = v * (1 - (s * (1 - f)));
switch (j)
{
case 0: r = v; g = t; b = p; break;
case 1: r = q; g = v; b = p; break;
case 2: r = p; g = v; b = t; break;
case 3: r = p; g = q; b = v; break;
case 4: r = t; g = p; b = v; break;
case 5: r = v; g = p; b = q; break;
default: r = v; g = t; b = p; break;
}
}
/// <summary>
/// Wrapper around HsvToRgb() which takes buffers as parameters instead of individual components.
/// </summary>
/// <param name="hsv">The HSV buffer</param>
/// <param name="rgb">The RGB buffer</param>
static void HsvToRgb(T* hsv, T* rgb)
{
HsvToRgb(hsv[0], hsv[1], hsv[2], rgb[0], rgb[1], rgb[2]);
}
/// <summary>
/// Calculates the alpha.
/// Used for gamma correction in final accumulation.
/// Not the slightest clue what this is doing.
/// </summary>
/// <param name="density">Density</param>
/// <param name="gamma">Gamma</param>
/// <param name="linrange">Linear range</param>
/// <returns>Alpha</returns>
static T CalcAlpha(T density, T gamma, T linrange)
{
T frac, alpha;
T funcval = pow(linrange, gamma);
if (density > 0)
{
if (density < linrange)
{
frac = density / linrange;
alpha = (T(1.0) - frac) * density * (funcval / linrange) + frac * pow(density, gamma);
}
else
alpha = pow(density, gamma);
}
else
alpha = 0;
return alpha;
}
/// <summary>
/// Calculates the new RGB and stores in the supplied buffer.
/// Used for gamma correction in final accumulation.
/// Not the slightest clue what this is doing.
/// </summary>
/// <param name="cBuf">The input RGB color buffer 0 - 1</param>
/// <param name="ls">Log scaling</param>
/// <param name="highPow">Highlight power, -1 - 1</param>
/// <param name="newRgb">Newly computed RGB value</param>
template<typename bucketT>
static void CalcNewRgb(bucketT* cBuf, T ls, T highPow, bucketT* newRgb)
{
size_t rgbi;
T newls, lsratio;
bucketT newhsv[3];
T maxa, maxc;
T adjustedHighlight;
if (ls == 0 || (cBuf[0] == 0 && cBuf[1] == 0 && cBuf[2] == 0))
{
newRgb[0] = 0;
newRgb[1] = 0;
newRgb[2] = 0;
return;
}
//Identify the most saturated channel.
maxc = std::max(std::max(cBuf[0], cBuf[1]), cBuf[2]);
maxa = ls * maxc;
//If a channel is saturated and highlight power is non-negative
//modify the color to prevent hue shift.
if (maxa > 255 && highPow >= 0)
{
newls = T(255.0) / maxc;
lsratio = pow(newls / ls, highPow);
//Calculate the max-value color (ranged 0 - 1).
for (rgbi = 0; rgbi < 3; rgbi++)
newRgb[rgbi] = bucketT(newls) * cBuf[rgbi] / bucketT(255.0);
//Reduce saturation by the lsratio.
Palette<bucketT>::RgbToHsv(newRgb, newhsv);
newhsv[1] *= bucketT(lsratio);
Palette<bucketT>::HsvToRgb(newhsv, newRgb);
for (rgbi = 0; rgbi < 3; rgbi++)
newRgb[rgbi] *= T(255.0);
}
else
{
newls = T(255.0) / maxc;
adjustedHighlight = -highPow;
if (adjustedHighlight > 1)
adjustedHighlight = 1;
if (maxa <= 255)
adjustedHighlight = 1;
//Calculate the max-value color (ranged 0 - 1) interpolated with the old behavior.
for (rgbi = 0; rgbi < 3; rgbi++)
newRgb[rgbi] = bucketT((T(1.0) - adjustedHighlight) * newls + adjustedHighlight * ls) * cBuf[rgbi];
}
}
int m_Index;//Index in the xml palette file of this palette, use -1 for random.
string m_Name;//Name of this palette.
shared_ptr<string> m_Filename;//Name of the parent file this palette came from, can be empty.
vector<v4T> m_Entries;//Storage for the color values.
};
}